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UNIVERSITY OF CALIFORNIA, DAVIS DEPARTMENT OF CIVIL AND ENVIRONMENTAL ENGINEERING COURSE: WATER RESOURCES SIMULATION (ECI 146)
CRN 29727; 4 units INSTRUCTOR: Fabián A. Bombardelli (fabombardelli@ucdavis.edu, fabianbombardelli2@gmail.com, bmbrdll@yahoo.com) OFFICE: 3105, Ghausi Hall Class: Tuesdays and Thursdays-12:10 PM to 1:30 PM (Olson 118) Computer lab: Fridays-1:10 PM to 2:00 PM (Academic Surge 1044) READER: Mr. Kaveh Zamani (kzamani@ucdavis.edu) TEACHING ASSISTANT: Ms. Kate Hewett (kmhewett@ucdavis.edu)

COMPUTER PROBLEM 1: Solution of the Colebrook-White equation via three different methods. Assigned on: Friday, January 13, 2012 Due on: Tuesday, January 24, 2012

Introduction The Moody diagram is the most reliable source of information for computation of flow resistance in pipes and, to some extent, in open channels. Based on extensive sets of measurements and regressions, it gives the Darcy-Weisbach resistance coefficient, f , as a function of the Reynolds number, and the ratio between the equivalent roughness and the pipe diameter. The diagram presents several regions for turbulent flow, as follows: a) a zone of “fully-rough” flow towards the right side of the diagram, where the relative roughness determines the characteristics of the flow and in which the Reynolds number does not play any role in determining the flow behavior; b) a zone of smooth behavior, in which the roughness value is immaterial in defining the flow characteristics, and c) an intermediate zone, usually called “transition zone,” where both variables are important in characterizing the flow. On the left, the laminar flow region appears, which is a function of the Reynolds number. The use of the diagram is straightforward: we must follow the curve pertaining to the value of the “relative roughness” (from the right of the diagram) until we find the vertical corresponding to the Reynolds

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